tìm lỗi sai và sửa

Here are the corrections for each sentence: 11. I have seen lots of interesting places when I went on holiday last summer. Correction: "I saw lots of interesting places when I went on holiday last summer." 12. When my cat heard a noise in the bushes, she stopped moving and listen intently. Correction: "When my cat heard a noise in the bushes, she stopped moving and listened intently." 13. I think it's time you must change your way of living. Correction: "I think it's time you changed your way of living." 14. Roger felt the outside of his pocket to make sure his wallet is still there. Correction: "Roger felt the outside of his pocket to make sure his wallet was still there." 15. When I'm shopping in the supermarket, I ran into an old friend who I hadn't met for five years. Correction: "When I was shopping in the supermarket, I ran into an old friend who I hadn't met for five years." 16. The police arrested the man while he is having dinner in a restaurant. Correction: "The police arrested the man while he was having dinner in a restaurant." 17. Peter and Wendy first met in 2006, and they are married for three years now. Correction: "Peter and Wendy first met in 2006, and they have been married for three years now." 18. Some people are believing there is life on other planets. Correction: "Some people believe there is life on other planets."